A love triangle heats up among Marley, Jake and Ryder, and Blaine has a run-in with the Warblers.

It's time for Sectionals, and New Directions receives guidance from some of the recent McKinley graduates who volunteer to mentor the glee club during their Thanksgiving breaks. Meanwhile, Rachel and Kurt have a non-traditional holiday dinner in the Big Apple.

McKinley’s Sadie Hawkins dance offers several gleeks a rare chance to feel empowered. Sam and Blaine investigate a possible cheating scandal at Sectionals. Kurt makes a new friend at NYADA.

The members of New Directions are back in action and take on their biggest assignment yet: the Beatles! As Will enlists the kids to pay homage to the classic song catalog from the Fab Four, Blaine and Kurt attempt to answer questions about their future together. Meanwhile, Rachel's New York ambitions take an unexpected turn.